<template>
  <div>
    b组件
    {{ $route.query.id }}
    <router-link to="/b1">b1</router-link>
    <router-link to="/b2">b2</router-link>
    <router-view></router-view>
  </div>
</template>
<script>
export default {
  data() {
    return {};
  },
  mounted() {

  },
};
</script>